Summaries posted online for Access-to-Information requests to federal departments and agencies reveal that a lot of requested information, according to the government, simply doesn't exist.

Kady O'Malley looks at some of the requests noteworthy for revealing a complete lack of records.

Part one: Back down the rabbit-hole in search of documents that never were - federal departments.

Part two: Through the Looking Glass (And What You Won't Find There) - federal agencies, institutions and Crown corporations.